//: Playground - noun: a place where people can play


import UIKit

//1>指向的内存地址不可以修改 0x100
let view : UIView = UIView()
//view = UIView() 0x200 不可以

//2>通过内存找到的对象，内部的属性是可以修改的
view.alpha = 0.5
view.backgroundColor = UIColor.blue


		